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How to Replace Window Panes

A damaged window pane can be a nuisance. This could be an opportunity to upgrade to energy-efficient windows or insulated ones, and reap benefits like increased comfort, increased resale value and lower utility costs.

It's a project you can do yourself for less than the cost of hiring an expert. You only need the right tools and a few hours of your time.

Glass

If your single-pane windows are outdated damaged, cracked or deteriorating, replacing them with newer glass that is tempered or insulated can improve energy efficiency and reduce noise while also preserving the historic integrity of older homes. The majority of homeowners with basic hand tools can repair a window pane. In addition to a new pane, the following items are required for the replacement process: latex glazing putty pliers, glazier's points and an electric heater to warm the old putty, if needed. Before starting, wear gloves and safety goggles as working with broken glass could cause injuries.

Take away any broken glass pieces remaining. This is best done using pliers, though using a flathead screwdriver can also be used in the pinch. Make use of a wood chisel or putty knives, to take away any old putty remaining around the frame and window sash. Be careful and slow making sure not to break the current window sash. This is best done on a ladder, not on the ground. Also, ensure that someone on the ground to hold it steady.

Make sure the window frame is ready to accommodate the new pane when you have removed the old putty. Find the width and the height of the opening in the sash and subtract 1/8 inch from each measurement (to allow for seasonal expansion and contraction). These measurements can be sent to a hardware or home center store to get a piece cut of glass stock to the proper size. You can cut the glass yourself if you possess the appropriate tools.

After installing the new pane, run a small bead of caulking around the edge to ensure it is weatherproof. Install a glazier's point on both sides of the frame. This will help secure the pane. The points shouldn't be too tight that they create friction between the frame and sash but they shouldn't be loose.

Before applying the putty to the surface, you must knead it thoroughly until it is smooth and free of lumps. Roll it into pencil-sized strips. Apply the first strip to the frame's corner. Work from corner to corner to ensure it's even and smooth.

Glazier's Points

The glazier's points are the small triangular pieces of metal that help secure glass into frames for windows without scratching or damaging the delicate surface. Knowing how to use these little helpers is easy and could save you money on a professional installation or the cost of windows replacement of buying new glass.

After taking off the old putty, glazier points and any remnants, clean the frame thoroughly using a utility knife. If necessary it is necessary to lightly sand the wood along the grooves of the rabbets to smooth out rough spots. If you sand wood, protect it with painter’s tape to prevent accidental damage.

Note down the dimensions of the frame. Bring these measurements to a hardware store or a home center and request that the new pane cut smaller than the frame's opening. This will ensure that the pane fits snugly and allows for expansion and contraction.

Insert the new pane into the frame and push firmly with your hands. Then use the point of your chisel or back of the putty knife to make a tap on the glazier's points as shown in Figure 11. The glazier's points should sit in line with the top edge of your pane, and the shoulders should be just beneath that lip.

Apply a small amount of glazing compound over the edges of the glass that has been made and into the rabbet grooves to seal and protect them. Allow it to dry and cure completely.

Install the new window sash when the glazing compound has dried. The first step is to coat the wood with an even layer of linseed. This will prevent the new putty drying out or cracking due to the moisture it absorbs. Apply the coating using a brush this coat, or the tip of the putty blade. Then use the chisel that is on the back of the putty tool or the back of the handle to gently hammer the new sash or glazier's point into the grooves of the rabbet. Repeat this process in intervals of 10 inches all around the frame.

Putty

A hurled baseball or a rock that is errant or a falling branch can cause a window to break or crack. Fortunately, the majority of windows can be easily replaced by simply placing a new piece in place. The glass is held in place with tiny metal clips known as the glazier's pointed and putty, also called glazing compound. Before installing a replacement pane, first take out the old one and clean up the area with an abrasive and an abrasive scraper that is a pull type or the wood chisel. Wear safety glasses and gloves while working. If the window is secured to the frame, you'll need to make use of a heat gun to soften the adhesive prior to taking it off.

If you're planning to install your original sash, remove the molding that supports the old pane. Sand the sash until it is flat and ready for new caulk. Once the sash is put back in place then, you can apply a silicone caulk to the glass. This will ensure that it doesn't get soiled or discolor over time.

Remove the glazing points from the rabbets. These are the grooves in the sash, where the glass is located. If they're difficult to cut out, you can try holding a hand tool like a heat gun to soften them before you do. If you're using a heat gun, be cautious not to damage the railings or sash by placing the tool too tightly.

After the old points of glazing and putty are removed, make a bed for the new pane. Roll a rope made of glazing compound between your fingers, and make it around 1/2 inch thick. Press it into the rabbets where the glass will be placed. It is crucial that the glass rests against the putty in all places on both sides If you have to tap it, gently press the glass into the rabbet using your thumb.

If the new pane has a crack you can fill it with a solvent-based glue or silicone caulk prior to pressing it into the sash. If the crack isn't sealed, you'll require putty to keep the water out. After the putty has dried remove the oily film from the glass and allow it to dry completely before painting. Paint before the putty has completely dried. It will not make a strong seal and may discolor or leak over time.

Paint

If you've experienced a broken window pane, you might be worried about the expense of replacing it. In reality, replacing a single pane of glass doesn't need to be costly when you do it on your own. Even double glazed windows replacement-paned windows can be replaced at a fraction of the cost it will cost an expert.

First, if you are working on a large-sized window, ensure that it is securely attached to the frame. This task is relatively easy and fast with the appropriate tools and techniques.

If you're ready to begin taking off the old window by removing the glazing points of metal that are attached to it. These are tiny triangles of metal which act as "nails" that hold the window in the frame. They are placed beneath a layer of glazing putty that hardens into a solid, moulded wedge which holds the window in place and hides the points.

After you have the old pane removed, clean up the surrounding frame and wood. Scrape off any paint that has been used and sand down the rabbet grooves where the glazing points were placed. Sand them to bare wood surfaces, so that you can paint the frames with the same color. After sanding the wood, apply a layer of flax oil. This will help to prolong the life of the frame.

Next, measure the width of the window opening. You will need to take vertical and horizontal measurements of the entire opening, and also the thickness of the old pane. Subtract 1/8 inch from each measurement to ensure you get a precise size for the new pane. This will allow for seasonal changes in the glass. You can take these measurements to a hardware or home improvement shop and have the glass cut for you.

Now, it's time to bed the new window pane. To do this, place the pane inside the frame and move it around until a 1/16 inch of putty remains between the edge of the glass and the sash on all four sides. Use a putty knife to smear the putty evenly, making sure that there isn't an excessive amount of excess putty in the corners and along the edges. When the putty dries, it can be painted with the same color as the frame to prevent water and air from leaking into the frame and causing fogging.